So I downloaded those files. However in the IDE, I can't seem to force it to ask for the DFU.

I read in the hardware setup tutorial that it would prompt me to do so, but my firmware is also up-to-date with 2.6.0 (according the IDE). It does ask me if I want to reset to the release version, but that didn't seem to go well. I'm still at 2.6.0.